diff --git a/103280/TS_103_280.schema.json b/103280/TS_103_280.schema.json
index aa63f8183191f19ae988167b37237d9a34ca1a3f..dc37eddccfb6d4090a6abceaecf5aab65e8cbf16 100644
--- a/103280/TS_103_280.schema.json
+++ b/103280/TS_103_280.schema.json
@@ -407,6 +407,17 @@
         "etsi280:latitude",
         "etsi280:longitude"
       ]
+    },
+    "H323URI": {
+      "type": "string",
+      "pattern": "^h323:[a-zA-Z0-9!#$&-;=?-\\[\\]_~%]+$"
+    },
+    "IMPU": {
+      "type": "string",
+      "pattern": "^[a-zA-Z0-9!#$&-;=?-\\[\\]_~%]+$"
+    },
+    "IMPI": {
+      "$ref": "#/$defs/NAI"
     }
   }
 }
diff --git a/103280/TS_103_280.xsd b/103280/TS_103_280.xsd
index ef73723916b7d5abf8e2bc539a51766f0af70414..95b4aa74b1be22ab7a1b2fe3c0227d992c60a455 100644
--- a/103280/TS_103_280.xsd
+++ b/103280/TS_103_280.xsd
@@ -297,4 +297,17 @@
     <xs:simpleType name="DNN">
         <xs:restriction base="LongString"/>
     </xs:simpleType>
+    <xs:simpleType name="H323URI">
+        <xs:restriction base="ShortString">
+            <xs:pattern value="h323:[a-zA-Z0-9!#$&amp;-;=?-\[\]_~%]+"/>
+        </xs:restriction>
+    </xs:simpleType>
+   <xs:simpleType name="IMPU">
+        <xs:restriction base="ShortString">
+            <xs:pattern value="[a-zA-Z0-9!#$&amp;-;=?-\[\]_~%]+"/>
+        </xs:restriction>
+    </xs:simpleType>
+   <xs:simpleType name="IMPI">
+        <xs:restriction base="NAI"/>
+    </xs:simpleType>
 </xs:schema>